A head-on collision between a bus and a truck in Brazil has resulted in at least 21 fatalities. The accident occurred on a highway connecting southern Brazil with São Paulo. Details surrounding the cause of the crash are currently under investigation by authorities. Emergency services were dispatched to the scene to provide assistance and recover the victims. This is a developing story with potential for further updates as more information becomes available. The incident has prompted discussions about road safety measures on Brazilian highways. The exact identities of the deceased are being withheld pending notification of families.